Short-circuiting device for alternating-current motors



Jan. 26 1926.

H. G. REIBEL 5r AL SHORT CIRCUITING DEVICE FOR ALTEENATING CURRENT MOTORS Filed. April 1924 #4 Wi 3% I A T TORNE Y6.

Patented Jan. 26, 1926.

UNE'E'ED STATES PATENT QFFECE.

HERMAN G'- REIBEL AND VIRGIL P. SPARKS, OF V/"AERE'N, 01510, .ASSIGNORS TO THE EEERLESS ELECTRIC COMPANY, OF WARREN, OHIO, A CORPORATION OF OHIO.

SHORTCIRCUITING DEVICE FOR ALTERNATING-CURRENT MOTORS.

Application filed April 14, 1924.

To all whom it may concern Be it known that we, HERMAN G. Barman and Vmern P. SPARKS, both of Warren, in the county of Trumbull, State of Ohio, citi- 6 ZGUS of the United States, have invented certain new and useful Improvements in Short-Circuiting Devices for Alternating- Current Motors; and We do hereby declare the following to be a full. clear, and exact to description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

Our invention relates to a short circuiting device for alternating current motors, and it 15 has for its object to simplify the construction and operation of devices of this character and to insure a firm contact between the short circuiting unit and the commutator after the motor has changed over from the repulsion to the induction operation.

In the drawings, Figure 1 is a fragmcntary view depicting a commutator equipped with the improved short circuiting device; Figure 2 is a face plan view of the device; and Figures 3 and l are plan and edge views, respectively, of one of the governor weights.

Referring more in detail to the drawings, the numeral 1 indicates the armature of an 30 alternating current motor, 2 the commutator and 3 the shaft, the commutator being recessed on is side to form a beveled face at concentric about the shaft.

The improved short circuiting device comprises an assembly Or unit embodying an annular series of short circuiting plates or segments 5 and a cage which is herein dopicted as being composed of a flat ring 6, having inner and outer peripheral flanges 7 and 8 between which the segments are disposed, and acylindrical retainer ring fitting within the inner flange 8 and having a radial flange partially overlying the segments to function as a keeper therefor. The short circuiting segments are correspondingly beveled to firmly contact or engage the beveled face t of the commutator. A disklike support or cup 10 is provided with a hub sleeve 11 slidable on the shaft 3, and also a plurality of tongues 12 which are struck outwardly, within the ring 9, to engage over the inner surface thereof for supporting the short circuiting assembly. A spring 13, encircling the shaft, is compressed between the commutator and governor Serial No. 706,468.

weight cup to urge the assembly away from the commutator.

The governor weights 14 are arranged about the shaft within an inclined wall providing a cam surface 15 of the cup 10 and are further enclosed within a guide cup 16 having radial slots 17 to receive cooperating guide pins 18 of the weights. The guide cup has a hub sleeve 19 mounted on the shaft, and a flange 20 encircling the flared or beveled wall 15 of the weight cup. A. retaining ring 21, fitting within the groove 22 of shaft 3, serves to hold the parts of the short circuiting device in assembled relation.

The general operation of short circuiting a motor is well known in the art, and after the motor has started, by repulsion, and a predetermined speed attained, the governorweights 1st moving under centrifugal iufluenco or force, ride outwardly cumming or wedging against the l evelcd wall 15 of the governor cup. T he resultant action that the outwardly moving weights shift the short circuiting assen'ibly in an axial direction to make contact between the beveled faces of the segments 5 and the wall 4t of the commutator, thus changing the motor over from one operatin as a repulsion motor to one operating as an induction motor.

When the speed of the motor decreases. the spring 13 will function to separate the commutator and the short circuiting unit, the flared wall 15 serving to contract the series of governor weights.

in accordance with the patent statutes, we have described and illustrated the invention in concrete form, but it will be expressly understood that various changes and modifications may be made therein without departin from the spirit of the invention, the scope of which is defined by the following claims.

Vi e claim as our invention:

1. In an electric motor, a commutator, a shaft therefor, a short circuiting ring, a disk-like support for the ring slidable on the shaft and having tongues struck out against the ring to support the same, and a governor for sliding the support, said gover nor consisting of a plurality of radially movable members and the support having a beveled peripheral flange against which said members engage.

2. In an electric motor, .short circuiting .sua ort and overnor wei 'hts inter osed between the support and the guide for radial movement against the flared periphery of the support.

3. In an electric motor, a commutator, a shaft therefor, an annular series of short circuiting elements, a carrier therefor, a disk like support for said carrier slidably mounted on said shaft, tongues struck laterally from said support to engage and sustain said carrier, and a governor for sliding said support.

t. In an electric motor, a commutator, a shaft therefor, an annular series of short circuiting elements, a carrier therefor comprising a ring of U-shaped cross section, a second ring having a laterally extending flange for engaging and holding the short circuiting elements in said first mentioned ring, a disk like support for said carrier slidably mounted on said shaft, tongues struck laterally from said support to engage and sustain said carrier, and a governor for sliding said support.

5. In an electric motor, a commutator, a shaft therefor, an annular series of short circuiting elements, a carrier therefor, a disk like support for said carrier slidably mounted on said shaft and having an outwardly flared periphery, tongues struck laterally from said support to engage and sustain said carrier, means for yieldingly holding said support in a position to maintain said short eircuiting elements out of engagement with said commutator, a weight guide, radially movable governor weights interposed between said-guide and said support for radial movement against the flared periphery of said support, and said weights having a pin and slot connection with said guide.

6. In an electric motor, short circuiting device, a ring-like series of short circuiting elements, a. slidable .support therefor having an outwardly flared periphery, an abutment on said shaft, governor weights arranged about said shaft between said abutment and said support for radial movement against the flared periphery of said support, and a pin and slot connection between said weights and said abutment for guiding said weights in their radial movement.

7. In an electric motor, short circuiting device, a ring-like series of short eircuiting elements, a slidable support therefor having an outwardly flared periphery, an abutment on said shaft, governor weights arranged about said support for radial movement against the flared periphery of said support, and a pin and slot connection between said weights and said abutment for guiding said weights in their radial movement, said slotbeing of a length to prevent movement of said weights beyond the flared periphery of said support.

8. In an electric motor, a commutator, a shaft therefor, an annular series of short eireuiting elements, a carrier therefor, comprising a ring of U-shaped cross section for receiving said short circuiting elements, a second ring engaging said first mentioned ring and having a laterally extending flange for engaging and holding the short circuiting elements in said first mentioned ring, and a governor for sliding said support.

In testimony whereof we have signed this specification.

HERMAN G. REIBEL. VIRGIL P. SPARKS. 

